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An Investigation Into the Corrosion Behavior of Mgo/Zro2 Nanocomposite Coatings Prepared by Plasma Electrolytic Oxidation on the Az91 Magnesium Alloy Publisher



Eslamzadeh N1 ; Ebrahimikahrizsangi R1 ; Karbasi S2 ; Zarebidaki A3 ; Gharavi F4
Authors
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Authors Affiliations
  1. 1. Advanced Materials Research Center, Materials Engineering Department, Najafabad Branch, Islamic Azad University, Najafabad, Iran
  2. 2. Department of Biomaterials and Tissue Engineering, School of Advance Technology in Medicine, Isfahan University of Medical Sciences, Isfahan, Iran
  3. 3. Corrosion Engineering and Material Protection Group, Bandar Abbas Campus, Amirkabir University of Technology, Tehran, Iran
  4. 4. Department of Materials Engineering, Sirjan Branch, Islamic Azad University, Sirjan, Iran

Source: Journal of Materials Engineering and Performance Published:2017


Abstract

Plasma electrolytic oxidation (PEO) of AZ91 Mg alloys was performed in ZrO2 nanoparticles containing Na2SiO3-based electrolytes. The phase composition and the microstructure of PEO coatings were analyzed by x-ray diffraction and scanning electron microscopy followed by energy dispersive spectroscopy. Pitting corrosion properties of the coatings were investigated using cyclic polarization and electrochemical impedance spectroscopy tests in a Ringer solution. The results showed the better pitting corrosion resistance of the composite coating, as compared to the oxide one, due to the thickened inner layer and the decrease in the surface defects of the composite coating. Also, the PEO process decreased the corrosion current density from 25.06 µA/cm2 in the Mg alloy to 2.7 µA/cm2 in the oxide coating and 0.47 µA/cm2 in the composite coating. © 2017, ASM International.
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